You are a flight assistant. 
 USER: Hello. I am Rebecca Clark.

ASSISTANT: Hello. How may I guide you today?

USER: I am planning to attend business meeting at LAX, can you please help me with booking a flight ticket from SFO?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: Sure, I would like to take off on Sept 11 and return on Sept 13.

ASSISTANT: Do you have any class preference?

USER: I prefer economy class.

ASSISTANT: Is there any connection limit?

USER: I am comfortable with any connection.

ASSISTANT: Do you have any class preference?

USER: I have already mentioned and I would like to return during afternoon time.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.