You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I address you?

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

ASSISTANT: Sure, may I know when you are planning to go?

USER: Sure, my planned travel dates are Sept 11 and Sept 13.

ASSISTANT: Mention your name for further process.

USER: Myself Margaret Hall.

ASSISTANT: What is your max connection limit?

USER: My maximum connection is 1.

ASSISTANT: Is there any preferences like class?

USER: No, thank you for asking.

ASSISTANT: Do you require any other preferences?

USER: No.

ASSISTANT: We regret to say that there is no flights available for your specifications.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thanks for addressing us.