You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I'm Melissa Green.

ASSISTANT: How may I help you today?

USER: I have to attend Chocolate festival at Seattle, can you please book me a ticket?

ASSISTANT: Sure, may I know your preferable dates please?

USER: Yes, my planned dates for travelling are 07/28 and 07/30.

ASSISTANT: Ok, can I have your origin and destination codes please?

USER: Sure, my source and destination airport codes are PHL and SEA.

ASSISTANT: Ok, wait for a minute please.

USER: Sure, take your time.

ASSISTANT: Yes, I found a flight-1015 with the UA airlines and the price is 100. Shall I proceed with the booking?

USER: That's fine for me, please go with booking.

ASSISTANT: Yes Green, your ticket is confirmed.

USER: Thank you so much for booking.