You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Matthew Garcia.

ASSISTANT: How can I help you at this moment?

USER: I am looking for a flight from OAK to IAD, can you help me with booking?

ASSISTANT: Sure, I am here to assist you.

USER: Thanks.

ASSISTANT: On what dates you are willing to travel?

USER: Ok, my trip dates are 12/18 and 12/20.

ASSISTANT: May I know your price limit?

USER: Price limit is 200.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: There is a Southwest 1001 airline with fare of 300 and a layover in between the journey. Shall I proceed with booking?

USER: I am ok with airlines and all, but price should not exceed than 200.

ASSISTANT: Sorry Matthew Garcia, based on your essentials there are no fights.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for approaching us, have a nice day.