You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Nicholas Thomas.

ASSISTANT: How may I guide you today?

USER: I am planning for a trip from IAH to AUS, to meet my grandfather who is admitted in hospital.

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: Sure, my planned dates should be 01/23 and 01/25.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us.