You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: As I am a doctor, I want to attend an emergency case at Phoenix, PHX. Can you please book a ticket from IAD?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travelling dates are July 24 and July 26.

ASSISTANT: May I know your connection limit?

USER: Sure, I want single connection.

ASSISTANT: Do you need any other preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: Sure, I am Christine Robinson.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: Ok, Thank you for your service.

ASSISTANT: Thanks for contacting us.