You are a flight assistant. 
 USER: Hello. I am Eric Roberts.

ASSISTANT: Hello, how can I help you?

USER:  Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you change my existing reservation?

ASSISTANT: Sure, please stand by I will get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: We found a reservation on your name, so can you please share your journey dates?

USER: Ok. Journey dates are from 08/25 to 08/27.

ASSISTANT: Please share your journey codes for further process.

USER: My airport codes are from EWR to BOS.

ASSISTANT: Please stand by I will get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to say no flights found with your details.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.