You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Michael Wilson. Do you have any flight from SEA to LAS?

ASSISTANT:  Could you mention your travelling dates?

USER: My travelling dates are 07/24 and 07/26.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say this, no flights are available on your desired route.

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

ASSISTANT: Thank you for contacting us.