You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Donald White, want to travel from LAX to PHL. Can you please help me?

ASSISTANT: Sure, I am here to help you for this. Could you please mention your journey dates?

USER: My journey dates are from 01/10 to 01/12.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry to inform, no flights are found wth your criteria.

USER: It's ok, thank you.

ASSISTANT: Thank you very much for contacting us.