You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Robert Young, want to travel from PHL to DFW to attend a conference meeting. Will you please help me in booking my ticket?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My journey dates are 05/25 and 05/27.

ASSISTANT: Please hold on for a while.

USER: Ok.

ASSISTANT: Sorry Robert, no flight is available on your route.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for reaching us.