You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you help me to change dates in my recent reservation?

ASSISTANT: Sure, I will help you in changing your reservation. Can you please provide your name to check the reservation status?

USER: Thank you for your positive response. The ticket is under the name Cynthia Johnson.

ASSISTANT: Sorry Cynthia Johnson, there is no active reservation under your name in our booking list.

USER: No issue, anyway thank you for checking.

ASSISTANT: You are welcome, thank you for reaching us.