You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Justin Miller.

ASSISTANT: How can I assist you today?

USER: I need to change my existing reservation, can you please help me out?

ASSISTANT: Ok, please can you wait a moment while I check for the reservation status?

USER: Please take your time.

ASSISTANT: Thank you for waiting, sorry to inform there is no reservation been found on your name. Thank you for connecting with our agency.

USER: That's not an issue, thank you for searching the details.