You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jennifer Miller.

ASSISTANT: How may I guide you?

USER: I want to book DFW and BOS, can you please book a ticket?

ASSISTANT: Jennifer Miller, I am here to help you for this. When would you like to travel?

USER: My travel dates are from Sept 27 and Sept 29.

ASSISTANT: At what time are you planning to depart and return?

USER: My depart time is morning.

ASSISTANT: Do you have any airline preference?

USER: My airline preference is Normal cost.

ASSISTANT: Are you prefer any class?

USER: Yes, I need a economy class.

ASSISTANT: Sorry to intimate you, no flights are found with your criteria.

USER: Ok, no problem,. Thank you.

ASSISTANT: You are most welcome, thank you very much for approaching our agency.