You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you?

USER: I am Donna Gonzalez. I need to change my existing reservation, as my exam got postponed. Please help me in changing?

ASSISTANT: Sure, we will help you in changing. Please give me a moment to check your details in our reservation list and let you know the status. We have checked the reservation list and found a reservation on your name, so please provide me your new journey details.

USER: Ok, no issues. My new trip dates are 10/20 and 10/22.

ASSISTANT: Ok.

USER: My journey is from ORD to HOU.

ASSISTANT: Please wait a moment.

USER: I need a halt within the fare of 200.

ASSISTANT: We have a flight which exactly matching with you from Hawaiian airline at a fare 200 in flight 1026 flight. Shall I proceed?

USER: Ok, proceed. Thank you.

ASSISTANT: Your booking is done. Thank you for opting us.