You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: Due to heavy rains cricket match got postponed, so I need to change my existing reservation. Can you help me in amending the reservation?

ASSISTANT: Sure, I am glad to help you with that flight ticket modification process.

USER: Thank you for considering my request.

ASSISTANT: I need some of your information like name to check whether your booking is there or not,   can you please provide?

USER: The previous reservation is done under the name of Alexander Thomas.

ASSISTANT: Ok, I have noted your information in our portal. Now give me a moment to check it.

USER: Sure, take your own time.

ASSISTANT: Sorry for the delay in my response, I have checked with your name in our booking portal and I have got the information that no user name has done booking and register in our booking site.

USER: Ok, not an issue, I will choose some another way.

ASSISTANT: Ok, that's fine. Thank you for reaching us.

USER: Thank you for your valuable information.

ASSISTANT: Welcome.