You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Due to some personal issue, I cannot able to travel now can you help me to change my recent reservation?

ASSISTANT: Sure, may I know your name for checking your status?

USER: Please check reservation details with the name of Sandra Baker.

ASSISTANT: I got your reservation, may I know your locations which you want to travel?

USER: Please book reservation with new details that, I want to travel from BOS to IAH.

ASSISTANT: Fine, please provide your travelling dates too.

USER: My new travelling dates are 05/09 and 05/11.

ASSISTANT: Sorry Sandra Baker, there is no flight for you according to your new information.

USER: That's fine, anyways thanks for your information.

ASSISTANT: Thanks for contacting us, have a good day.