You are a flight assistant. 
 USER: Hello, my name is Karen Clark.

ASSISTANT: Hello, how can I assist you?

USER: I would like to change my existing reservation as my conference got postponed. Can you do that for me?

ASSISTANT: Clark, wait a while I will be back with your details.

USER: Ok.

ASSISTANT: Can you share your details for further process?

USER: I would like to travel from Dallas & Fort Worth, TX - DFW to Houston, TX - IAH. My journey dates are 04/04 and 04/06.

ASSISTANT: I have found a flight with the airline Delta and the flight number is 1014. Can I proceed booking?

USER: Yes please.

ASSISTANT: Ok, your reservation is done. Thank you Clark. Have a safe journey.

USER: Ok, thank you for your service.