You are a flight assistant. 
 USER: Hi, I am Elizabeth Brown.

ASSISTANT: Hello, how may I assist you?

USER: I want to go to Washington to establish new relationships, can you book a flight ticket with 200 ?

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my arrival and departure dates are 03/01 and 02/28.

ASSISTANT: Can you tell me your airport codes?

USER: Sure, I want to depart from LGA to IAD.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: There is no flight for you.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Most welcome.