You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Karen Robinson. Can you help me to make a flight reservation from IAH to SFO?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are 03/03 and 03/05.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's fine, thanks for your help.

ASSISTANT: Thank you for reaching us.