You are a flight assistant. 
 USER: Hello, I am Barbara Jones.

ASSISTANT: Hello,. Any assistance required?

USER: As my schedule of attending an press meet got postponed. Can you please help me in changing my existing reservation?

ASSISTANT: Definitely. Please wait for a while. Reservation found. May I know your travelling dates?

USER: My travel dates are 06/05 to 06/07.

ASSISTANT: Please provide airport codes.

USER: My airport codes are HOU to SEA.

ASSISTANT: Ok. Please provide ticket price limit.

USER: My price limit is 200.

ASSISTANT: No flights found with your requirement.

USER: Ok, no issue.

ASSISTANT: Thanks.

USER: Thank you for your information.