You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, please help me with your name to check your details.

USER: Myself Rachel Rodriguez.

ASSISTANT: I have found your reservation, can you please share your airport codes?

USER: My airport codes are from BOS to SEA.

ASSISTANT: Let me know your travelling dates?

USER: My trip dates are 05/22 and 05/24.

ASSISTANT: I have found a flight-1016 is available for you, shall I proceed?

USER: You can book it.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your help.

ASSISTANT: Welcome.