You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michael Collins.

ASSISTANT: How may I aid you?

USER: I would like to travel to San Francisco because one of my friend suggested me to visit that city, can you please help me to find a flight?

ASSISTANT: Sure, I am here to help you out. May I know your airport codes please?

USER: Thank you. I would like to travel from LAS to SFO.

ASSISTANT: May I know your travelling dates please?

USER: The planned travel dates are 12/12 and 12/14.

ASSISTANT:  Michael Collins, there are no flights available in your route.

USER: It's ok, not a problem with that. Thank you for searching the flight.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.