You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation due to my exams got postponed, so can you please help me with changing?

ASSISTANT: Sure, please provide me your name?

USER: My name is Gary White.

ASSISTANT: Please wait a minute.

USER: ok.

ASSISTANT: We found a new reservation, please provide me your travelling details.

USER: My journey airport codes are IAH and SFO. My travel dates are 05/11 and 05/13.

ASSISTANT: Are you comfortable with two connections.

USER: No, I need a single connecting flight.

ASSISTANT: Sorry there are no flights with your specifications.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.