You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that I can do for you now?

USER: Due to sudden change in my planned dates of journey, I would like to change my reservation. Can you please help me out with changing of my reservation?

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

USER: I have reserved my ticket with the name Samuel Allen.

ASSISTANT: Let me check with your information, please give me some time to check it.

USER: Ok, take your own time.

ASSISTANT: When I have checked there is no previous reservation found on the name Samuel Allen to modify the ticket.

USER: It's ok, not a problem. Anyways thank you for checking my reservation status.

ASSISTANT: It's my pleasure to help you and thank you for reaching us. Have a nice day.