You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mark Lopez.

ASSISTANT: How may I help you?

USER: I would like to travel from PHX to DFW, so can you help me in booking?

ASSISTANT: Sure, please provide your journey dates.

USER: My travelling dates are 05/20 and 05/22.

ASSISTANT: Please give me a minute.

USER: Sure.

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

USER: OK, no issues. Thank you for your time.

ASSISTANT: Thank you for approaching us.