You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from PHL to DEN, can you help me?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are 15 and 17 of Aug.

ASSISTANT: Do you have any specifications?

USER: I prefer to travel in economy class.

ASSISTANT: May I know your good name please?

USER: I am Mary Thompson.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.