You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Donald Martinez. Can you help me in booking from SFO to LAS, as I have to attend my sister wedding?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are 04/07 to 04/09.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights found as per your request.

USER: You can proceed with booking. No issue, thank you.

ASSISTANT: Thank you for approaching us.