You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Frank Phillips here.

ASSISTANT: How may I aid you today?

USER: Do you have any flight from HOU to OAK?

ASSISTANT: Frank can you please mention your trip dates, so I can check with that?

USER: My travel dates are 05/21 and 05/23.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Frank, there are no flights running on the route due to heavy snowfall.

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

ASSISTANT: Thank you for reaching our service.