You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden work, so I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, can I have your name please?

USER: Timothy Garcia here.

ASSISTANT: Ok, we found a reservation on your name, can you please share your planned travel dates?

USER: My planned trip dates will be on Apr 20 to Apr 22.

ASSISTANT: Let me know your airport codes?

USER: My airport codes are from SEA to DFW.

ASSISTANT: Any other preferences?

USER: I would like to travel in a connecting flight.

ASSISTANT: Sorry Timothy Garcia, no flights found with your given dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.