You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you help me to book a flight ticket from DCA to PHX?

ASSISTANT: Sure, can I know you trip dates?

USER: Ok, please can I know if you can book for the dates June 30 and July 2nd respectively?

ASSISTANT: Do you need any connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: Can I know your class preference?

USER: Ok, please book a economy class flight.

ASSISTANT: Can I know your name?

USER: My name is Melissa Taylor.

ASSISTANT: There is a flight on Delta airline, flight number 1005 with the fare of 200.

USER: Ok, please check for a flight which depart during morning.

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: Sorry, there are no flights available on your request.

USER: That is not a issue, thank you for assisting me.

ASSISTANT: Thank you for reaching us.