You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Frank Campbell.

ASSISTANT: Ok.

USER: I would like to travel from DFW to SFO to meet my friend. Can you help me for booking?

ASSISTANT: Sure, can you please tell me your travel dates?

USER: My travelling dates are 05/09 and 05/11.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your planning dates.

USER: That's ok, thank you for checking.

ASSISTANT: Do you have any other dates to travel?

USER: No.

ASSISTANT: Ok, thank you for opting us.