You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Mark Gonzalez here, I need to change my reservation as my plan to go for an adventure trip got postponed. Can you help me?

ASSISTANT: Sure, I am here to help you out. Please provide me your name.

USER: I have already mentioned above.

ASSISTANT: I found your reservation, can you please share your new travelling airport codes?

USER: I will be leaving from PHL and arrive at IAD.

ASSISTANT: On which dates you want me to book your tickets?

USER: My departure must be Oct 28 and arrival must be Oct 30.

ASSISTANT: Let me know your connection limit.

USER: I need 1 flag stop.

ASSISTANT: Do you have any specification?

USER: No.

ASSISTANT: We found a flight 1001 in UA airlines with 1 stopover and it costs you 100. Can I proceed?

USER: Fine, please proceed.

ASSISTANT: Your booking is done.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us, have a safe flight.