You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My friend has invited for his birthday party at Charlotte. Can you help me in booking a ticket?

ASSISTANT: Sure, on which dates you want to travel?

USER: I am planning to travel on dates 03/02 and 03/04.

ASSISTANT: Ok, may I know your codes of airport you want to travel?

USER: The airport codes are SFO and CLT respectively.

ASSISTANT: Sorry to say, no flights were found on your required dates.

USER: That's fine, I will find other way out. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: You are welcome.

ASSISTANT: May I know your name for documentation purpose?

USER: My name is George Johnson.

ASSISTANT: Thank you.