Dear + 对方的称呼 / To Whom It May Concern,
I am writing to introduce myself.
Allow me to introduce myself.
I would like to take this opportunity to introduce myself.
I am writing to express my sincere gratitude/thanks for…
I would like to extend my sincerest appreciation for…
I am writing to thank you for your kind/generous assistance.
I am writing to request your assistance/help with…
I hope that you could provide me with some assistance regarding…
I would be happy to assist you with…
Please let me know if I could be of any assistance.
I would like to extend an invitation to you to…
I would like to invite you to join me in…
I would like to suggest that…
In my opinion, it would be beneficial to…
Thank you for taking the time to read my letter.
I look forward to your prompt response.
Thank you for your attention and I hope to hear back from you soon.