You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is David Smith.

ASSISTANT: How may I help you?

USER: Can you aid me in booking flight ticket from Chicago, ORD to reach Oakland, OAK?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Can I have your depart date?

USER: Departure is on 10/29.

ASSISTANT: When will you return from your trip?

USER: I will return on 10/31.

ASSISTANT: Do you have any restriction on price?

USER: Yes, I can bare upto 1000 only.

ASSISTANT: Thank you for sharing the details, wait a while.

USER: Sure, make it in your possible time.

ASSISTANT: Thank you for being patience. There is a connecting flight of Delta airline available with fare 100 and 1003 as flight number. May I confirm it?

USER: It is perfect, you may now proceed for booking.

ASSISTANT: Your reservation has been confirmed in economy class.

USER: Thanks for your helping hand.

ASSISTANT: Thank you for reaching us.