You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Shirley Walker here.

ASSISTANT: How may I guide you?

USER: Can you please book me a ticket from EWR to LGA?

ASSISTANT: Sure, may I know your trip dates please?

USER: Sure, my journey dates are 07/27 and 07/29.

ASSISTANT: Walker, no flights has been found on your journey dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.