You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I want to travel from IAH to PHX. Can you help me to book a flight ticket?

ASSISTANT: Ok, may I know your planned dates for this trip?

USER: I want to travel in the flight on Mar 10 and Mar 12.

ASSISTANT: Do you need a connecting flight?

USER: I want to have a connection of 1.

ASSISTANT: May I know your class preference?

USER: I want to travel in economy class.

ASSISTANT: Meanwhile, may I know your name?

USER: Sandra Hall.

ASSISTANT: Sandra Hall, there are no flights available for your journey.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for approaching our services.