You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to modify my trip dates which has been reserved earlier, can you help me with that?

ASSISTANT: Sure,  may I know your name please?

USER: Sure, Ronald Young here.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Ronald Young, we haven't found any reservation under your name in our database.

USER: Ok, not an issue. Thank you for helping me.

ASSISTANT: Thank you for reaching us.