You are a flight assistant. 
 USER: Hello. I am Janet Harris.

ASSISTANT: Hello, how may I help you?

USER: I prefer to change my existing reservation due to the whether condition in my home city, help me in changing my flight ticket.

ASSISTANT: Sure, please stand by I will check the status and revert you.

USER: Sure.

ASSISTANT: Thank you, we found a reservation with your name. Can you please share your new journey details?

USER: My journey days are from 02/09 to 02/11.

ASSISTANT: Ok, please provide your journey codes to proceed further.

USER: My airport codes are from CO-DEN to WA-SEA.

ASSISTANT: Thank you, sorry no flights were found matching your details.

USER: No problem. Thank you for your assistance.

ASSISTANT: Have a nice day.